添加组件失败：addComponent: The component to add must be a constructor

Creator 2.x
#1

创建childClass类，继承于cc.Component，然后获取实例化对象childJS，将childJS作为组件添加到节点，失败。求大神指点~

  var childClass = cc.Class({
            extends: cc.Component,
            properties: {

            },
            onload: function (dt) {
                    cc.error('hello, child');
            },
            clickTest: function () {
                    cc.log('click Test');

            }
    });
    
    var childJS = new childClass();
    
    var childNode = new cc.Node('childNode');
    
    childNode.addComponent(childJS);

    this.node.addChild(childNode);

报错信息：
Simulator: addComponent: The component to add must be a constructor

应该在哪里添加构造函数吗，看了官方文档，但不太懂~

#2

childNode.addComponent(childClass);

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#3

childNode.addComponent(require(‘childClass’))

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